Central Bureau for Astronomical Telegrams
IAUC 4947: N LMC 1990; OS And; (2060)
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Read IAUC 4948
Circular No. 4947
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NOVA IN THE LARGE MAGELLANIC CLOUD 1990
S. Shore, Computer Sciences Corporation/GHRS; G. Sonneborn, NASA
Goddard Space Flight Center; C. Shrader, Computer Sciences
Corporation/IUE; and S. Starrfield, Arizona State University, report:
"Ultraviolet low-resolution observations of N LMC 1990 were obtained
with the IUE Satellite on Jan. 18.05 UT. The position agrees with that
given by McNaught on IAUC 4946. A 30-min short-wavelength (120-200 nm)
image shows that strong Fe II absorption systems dominate this portion
of the spectrum. The continuum is characteristic of that of a cool (F-
G) star, and the expanding shell is still optically thick in the
ultraviolet, implying that this nova has been caught very early in its
outburst. An 8-min long-wavelength (200-340 nm) spectrum shows Mg II
280 nm to be very strong (5 x continuum), with FWHM about 4000 km/s.
The only other long-wavelength emission is at Fe II 264 nm. We are
planning a series of ultraviolet spectra over the next few weeks and
urge that this nova be followed at other wavelengths. Fine-error-
sensor photometry gives V about 12.7 on Jan. 18.03 UT, about 1 mag
lower than initially announced. The spectrum appears intermediate
between that of a G0 I supergiant (22 Vul) and N LMC 1988 No. 1; the
continuum below 150 nm is stronger than observed at similar stages of
galactic classical novae (e.g., Nova OS And 1986)."
OS ANDROMEDAE
Visual magnitude estimates: 1989 Aug. 9.95 UT, 14.9 (M. Verdenet,
Bourbon-Lancy, France); 30.05, 15.7 (A. Boattini, Piazzano, Italy);
Sept. 30.84, [15.4 (Boattini); Nov. 29.86, 15.8 (Boattini).
(2060) CHIRON
K. J. Meech, University of Hawaii, reports that observations made
on 1989 Dec. 27 with the faint-object camera on the f/3.77 Canada-
France-Hawaii 3.6-m Telescope on Mauna Kea show that (2060) Chiron
still has a faint coma (cf. IAUC 4770). The low-surface-brightness
coma extends approximately 10" arcsec from the image center to the
northwest (near p.a. 315 deg). The brightness in the Mould R filter
was approximately 16.1. The coma was seen in a 700-s exposure in dark
skies with arcsec seeing.
1990 January 18 (4947) Brian G. Marsden
Read IAUC 4948
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